Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 401 insertions, 0 deletions

diff --git a/sim/ppc/pk_disklabel.c b/sim/ppc/pk_disklabel.c
new file mode 100644
index 0000000..91dcf7c
--- /dev/null
+++ b/sim/ppc/pk_disklabel.c
@@ -0,0 +1,401 @@
+/*  This file is part of the program psim.
+    
+    Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
+    
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+    
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+    
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+    
+    */
+
+
+#ifndef _PK_DISKLABEL_C_
+#define _PK_DISKLABEL_C_
+
+#ifndef STATIC_INLINE_PK_DISKLABEL
+#define STATIC_INLINE_PK_DISKLABEL STATIC_INLINE
+#endif
+
+#include "device_table.h"
+
+#include "pk.h"
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+
+
+
+/* PACKAGE
+
+   disk-label - all knowing disk I/O package
+
+   DESCRIPTION
+
+   The disk-label package provides a generic interface to disk
+   devices.  It uses the arguments specified when an instance is being
+   created to determine if the raw disk, a partition, or a file within
+   a partition should be opened.
+
+   An instance create call to disk-label could result, for instance,
+   in the opening of a DOS file system contained within a dos
+   partition contained within a physical disk.
+
+   */
+
+/* taken from bfd/ppcboot.c by Michael Meissner */
+
+/* PPCbug location structure */
+typedef struct ppcboot_location {
+  unsigned8 ind;
+  unsigned8 head;
+  unsigned8 sector;
+  unsigned8 cylinder;
+} ppcboot_location_t;
+
+/* PPCbug partition table layout */
+typedef struct ppcboot_partition {
+  ppcboot_location_t partition_begin;	/* partition begin */
+  ppcboot_location_t partition_end;	/* partition end */
+  unsigned8 sector_begin[4];		/* 32-bit start RBA (zero-based), little endian */
+  unsigned8 sector_length[4];		/* 32-bit RBA count (one-based), little endian */
+} ppcboot_partition_t;
+
+#if 0
+/* PPCbug boot layout.  */
+typedef struct ppcboot_hdr {
+  unsigned8		pc_compatibility[446];	/* x86 instruction field */
+  ppcboot_partition_t	partition[4];		/* partition information */
+  unsigned8		signature[2];		/* 0x55 and 0xaa */
+  unsigned8		entry_offset[4];	/* entry point offset, little endian */
+  unsigned8		length[4];		/* load image length, little endian */
+  unsigned8		flags;			/* flag field */
+  unsigned8		os_id;			/* OS_ID */
+  char			partition_name[32];	/* partition name */
+  unsigned8		reserved1[470];		/* reserved */
+} ppcboot_hdr_t;
+#endif
+
+
+typedef struct _disklabel {
+  device_instance *parent;
+  device_instance *raw_disk;
+  unsigned_word pos;
+  unsigned_word sector_begin;
+  unsigned_word sector_length;
+} disklabel;
+
+
+static unsigned_word
+sector2uw(unsigned8 s[4])
+{
+  return ((s[3] << 24)
+	  + (s[2] << 16)
+	  + (s[1] << 8)
+	  + (s[0] << 0));
+}
+
+
+static void
+disklabel_delete(device_instance *instance)
+{
+  disklabel *label = device_instance_data(instance);
+  device_instance_delete(label->raw_disk);
+  zfree(label);
+}
+
+
+static int
+disklabel_read(device_instance *instance,
+	       void *buf,
+	       unsigned_word len)
+{
+  disklabel *label = device_instance_data(instance);
+  int nr_read;
+  if (label->pos + len > label->sector_length)
+    len = label->sector_length - label->pos;
+  if (device_instance_seek(label->raw_disk, 0,
+			   label->sector_begin + label->pos) < 0)
+    return -1;
+  nr_read = device_instance_read(label->raw_disk, buf, len);
+  if (nr_read > 0)
+    label->pos += nr_read;
+  return nr_read;
+}
+
+static int
+disklabel_write(device_instance *instance,
+		const void *buf,
+		unsigned_word len)
+{
+  disklabel *label = device_instance_data(instance);
+  int nr_written;
+  if (label->pos + len > label->sector_length)
+    len = label->sector_length - label->pos;
+  if (device_instance_seek(label->raw_disk, 0,
+			   label->sector_begin + label->pos) < 0)
+    return -1;
+  nr_written = device_instance_write(label->raw_disk, buf, len);
+  if (nr_written > 0)
+    label->pos += nr_written;
+  return nr_written;
+}
+
+static int
+disklabel_seek(device_instance *instance,
+	       unsigned_word pos_hi,
+	       unsigned_word pos_lo)
+{
+  disklabel *label = device_instance_data(instance);
+  if (pos_lo >= label->sector_length || pos_hi != 0)
+    return -1;
+  label->pos = pos_lo;
+  return 0;
+}
+
+
+static const device_instance_callbacks package_disklabel_callbacks = {
+  disklabel_delete,
+  disklabel_read,
+  disklabel_write,
+  disklabel_seek,
+};
+
+/* Reconize different types of boot block */
+
+static int
+block0_is_bpb(const unsigned8 block[])
+{
+  const char ebdic_ibma[] = { 0xc9, 0xc2, 0xd4, 0xc1 };
+  /* ref PowerPC Microprocessor CHRP bindings 1.2b - page 47 */
+  /* can't start with IBMA */
+  if (memcmp(block, ebdic_ibma, sizeof(ebdic_ibma)) == 0)
+    return 0;
+  /* must have LE 0xAA55 signature at offset 510 */
+  if (block[511] != 0xAA && block[510] != 0x55)
+    return 0;
+  /* valid 16 bit LE bytes per sector - 256, 512, 1024 */
+  if (block[11] != 0
+      || (block[12] != 1 && block[12] != 2 && block[12] != 4))
+    return 0;
+  /* nr fats is 1 or 2 */
+  if (block[16] != 1 && block[16] != 2)
+    return 0;
+  return 1;
+}
+
+
+/* Verify that the device contains an ISO-9660 File system */
+
+static int
+is_iso9660(device_instance *raw_disk)
+{
+  /* ref PowerPC Microprocessor CHRP bindings 1.2b - page 47 */
+  unsigned8 block[512];
+  if (device_instance_seek(raw_disk, 0, 512 * 64) < 0)
+    return 0;
+  if (device_instance_read(raw_disk, block, sizeof(block)) != sizeof(block))
+    return 0;
+  if (block[0] == 0x01
+      && block[1] == 'C'
+      && block[2] == 'D'
+      && block[3] == '0'
+      && block[4] == '0'
+      && block[5] == '1')
+    return 1;
+  return 0;
+}
+
+
+/* Verify that the disk block contains a valid DOS partition table.
+   While we're at it have a look around for active partitions etc.
+
+   Return 0: invalid
+   Return 1..4: valid, value returned is the first active partition
+   Return -1: no active partition */
+
+static int
+block0_is_fdisk(const unsigned8 block[])
+{
+  const int partition_type_fields[] = { 0, 0x1c2, 0x1d2, 0x1e2, 0x1f2 };
+  const int partition_active_fields[] = { 0, 0x1be, 0x1ce, 0x1de, 0xee };
+  int partition;
+  int active = -1;
+  /* ref PowerPC Microprocessor CHRP bindings 1.2b - page 47 */
+  /* must have LE 0xAA55 signature at offset 510 */
+  if (block[511/*0x1ff*/] != 0xAA && block[510/*0x1fe*/] != 0x55)
+    return 0;
+  /* must contain valid partition types */
+  for (partition = 1; partition <= 4 && active != 0; partition++) {
+    int partition_type = block[partition_type_fields[partition]];
+    int is_active = block[partition_active_fields[partition]] == 0x80;
+    const char *type;
+    switch (partition_type) {
+    case 0x00:
+      type = "UNUSED";
+      break;
+    case 0x01:
+      type = "FAT 12 File system";
+      break;
+    case 0x04:
+      type = "FAT 16 File system";
+      break;
+    case 0x05:
+    case 0x06:
+      type = "rejected - extended/chained partition not supported";
+      active = 0;
+      break;
+    case 0x41:
+      type = "Single program image";
+      break;
+    case 0x82:
+      type = "Solaris?";
+      break;
+    case 0x96:
+      type = "ISO 9660 File system";
+      break;
+    default:
+      type = "rejected - unknown type";
+      active = 0;
+      break;
+    }
+    PTRACE(disklabel, ("partition %d of type 0x%02x - %s%s\n",
+		       partition,
+		       partition_type,
+		       type,
+		       is_active && active != 0 ? " (active)" : ""));
+    if (partition_type != 0 && is_active && active < 0)
+      active = partition;
+  }
+  return active;
+}
+
+
+/* Verify that block0 corresponds to a MAC disk */
+
+static int
+block0_is_mac_disk(const unsigned8 block[])
+{
+  /* ref PowerPC Microprocessor CHRP bindings 1.2b - page 47 */
+  /* signature - BEx4552 at offset 0 */
+  if (block[0] != 0x45 || block[1] != 0x52)
+    return 0;
+  return 1;
+}
+
+
+/* Open a logical disk/file */
+
+device_instance *
+pk_disklabel_create_instance(device_instance *raw_disk,
+			     const char *args)
+{
+  int partition;
+  char *filename;
+
+  /* parse the arguments */
+  if (args == NULL) {
+    partition = 0;
+    filename = NULL;
+  }
+  else {
+    partition = strtoul((char*)args, &filename, 0);
+    if (filename == args)
+      partition = -1; /* not specified */
+    if (*filename == ',')
+      filename++;
+    if (*filename == '\0')
+      filename = NULL; /* easier */
+  }
+
+  if (partition == 0) {
+    /* select the raw disk */
+    return raw_disk;
+  }
+  else {
+    unsigned8 boot_block[512];
+    /* get the boot block for examination */
+    if (device_instance_seek(raw_disk, 0, 0) < 0)
+      device_error(device_instance_device(raw_disk),
+		   "Problem seeking on raw disk");
+    if (device_instance_read(raw_disk, &boot_block, sizeof(boot_block))
+	!= sizeof(boot_block))
+      device_error(device_instance_device(raw_disk), "Problem reading boot block");
+
+    if (partition < 0) {
+      /* select the active partition */
+      if (block0_is_bpb(boot_block)) {
+	device_error(device_instance_device(raw_disk), "Unimplemented active BPB");
+      }
+      else if (block0_is_fdisk(boot_block)) {
+	int active = block0_is_fdisk(boot_block);
+	device_error(device_instance_device(raw_disk), "Unimplemented active FDISK (%d)",
+		     active);
+      }
+      else if (is_iso9660(raw_disk)) {
+	device_error(device_instance_device(raw_disk), "Unimplemented active ISO9660");
+      }
+      else if (block0_is_mac_disk(boot_block)) {
+	device_error(device_instance_device(raw_disk), "Unimplemented active MAC DISK");
+      }
+      else {
+	device_error(device_instance_device(raw_disk), "Unreconized bootblock");
+      }
+    }
+    else {
+      /* select the specified disk partition */
+      if (block0_is_bpb(boot_block)) {
+	device_error(device_instance_device(raw_disk), "Unimplemented BPB");
+      }
+      else if (block0_is_fdisk(boot_block)) {
+	/* return an instance */
+	ppcboot_partition_t *partition_table = (ppcboot_partition_t*) &boot_block[446];
+	ppcboot_partition_t *partition_entry;
+	disklabel *label;
+	if (partition > 4)
+	  device_error(device_instance_device(raw_disk),
+		       "Only FDISK partitions 1..4 supported");
+	partition_entry = &partition_table[partition - 1];
+	label = ZALLOC(disklabel);
+	label->raw_disk = raw_disk;
+	label->pos = 0;
+	label->sector_begin = 512 * sector2uw(partition_entry->sector_begin);
+	label->sector_length = 512 * sector2uw(partition_entry->sector_length);
+	PTRACE(disklabel, ("partition %ld, sector-begin %ld, length %ld\n",
+			   (long)partition,
+			   (long)label->sector_begin,
+			   (long)label->sector_length));
+	if (filename != NULL)
+	  device_error(device_instance_device(raw_disk),
+		       "FDISK file names not yet supported");
+	return device_create_instance_from(NULL, raw_disk,
+					   label,
+					   NULL, args,
+					   &package_disklabel_callbacks);
+      }
+      else if (block0_is_mac_disk(boot_block)) {
+	device_error(device_instance_device(raw_disk), "Unimplemented MAC DISK");
+      }
+      else {
+	device_error(device_instance_device(raw_disk),
+		     "Unreconized bootblock");
+      }
+    }
+  }
+  
+  return NULL;
+}
+  
+  
+#endif /* _PK_DISKLABEL_C_ */
+